Le 25/08/2017 à 21:47, David McGough a écrit :
I think Zoiper 3 and later has different CODECS (iLBC20 and iLBC30)
Thank you. I have iLBC30 installed, but I didn't see there was an iLBC20 :-) Good news :-)
I have tested G.729, but found it to have lower audio quality than iLBC, to my ear, at least, with about the same bandwidth use. The patents which did encumber most G.729 implementations are now expired.
Did you remember how you installed the codec on Asterisk side ? AFAIK specs say iLBC is 15 kbps and g729 is 8 kbps, so it should be half bandwidth ?
I have also experimentally added CODEC2 / 3200bps. Other than being CPU heavy (as expected), it works fine, but sounds closer to DMR-quality audio than is typically desirable for most AllStar use...But, this CODEC is by far the low-bandwidth leader of the free CODECs I've tested.
I'd like to test, too. To see if there is an interest to use it with poor mobile networks (but if a mobile network can't carry 8 kbps, it may not be able to carry 4 kbps much better...) Of course, I won't use it for my Asterisk backbone :-) But as far as we plan to integrate gateways with d-star and DMR, there won't be much difference if there are also IAX2 users @3kbps... Moreover, the quality of a 3kbps codec transcoded to another 3kbps codec is something I'm fearing a bit HI ;-) Do you know any mobile software that can support codec2 ? 73 de TK1BI